public class testdem
{
    public static void main(String[] args)
    {
//        System.out.println("hello");
         // ctrl + d 复制当前行,在下一行粘贴
        // ctrl + x 剪切当前行

        int a = 10;
        System.out.println(10);

        float b = 13.4f;
        System.out.println(b);

        double c = 13.4;
        System.out.println(c);

        char d = 'a';
        System.out.println(d);

        byte e = 127;
        System.out.println(e);

        boolen f = true;
        String s = "aaaa";

        int aa = 3;
        byte bb = (byte)aa;

        long g = 100;

        short t = 100;

         System.out.println("hello");
    }
}
